package org.util;

import org.hibernate.Session;
import org.hibernate.cfg.Configuration;

public class HibernateSessionFactory {
	private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();
	private static org.hibernate.SessionFactory sessionFactory;
	private static Configuration  configuration= new Configuration();
	private static String CONFIG_FILE_LOCALION = "/hibernate.cfg.xml";
	private static String configFile = CONFIG_FILE_LOCALION;
	static {
		try {
			configuration.configure(configFile);
			sessionFactory = configuration.buildSessionFactory();
		} catch (Exception e) {
			System.out.println("%%%% Error Creating sessionFactory %%%%%");
			e.printStackTrace();
		}
	}
	/**
	 * session 的工厂类
	 * @return
	 */
	public static Session getSession(){
		Session session = (Session)threadLocal.get();
		if(session == null || !session.isOpen()){
			if(sessionFactory == null){
				rebuildSessionFactory();
			}
			session = (sessionFactory!=null)?sessionFactory.openSession():null;
			threadLocal.set(session);
		}
		return session;
	}
	private static void rebuildSessionFactory() {
		try {
			configuration.configure(configFile);
			sessionFactory = configuration.buildSessionFactory();
			
		} catch (Exception e) {
			System.out.println("%%%% Error Creating sessionFactory %%%%%");
			e.printStackTrace();
		}
	}
	public static void closeSessionFactory(){
		Session session = (Session) threadLocal.get();
		threadLocal.set(null);
		if(session !=null)
		{
			session.close();
		}
	}
	public static org.hibernate.SessionFactory getSessionFactory(){
		return sessionFactory;
	}
	public static void setConfigFile(String configFile){
		HibernateSessionFactory.configFile = configFile;
		sessionFactory = null;
	}
	
	public static Configuration getConfiguration(){
		return configuration;
	}
}








